Contact   Imprint   Advertising   Guidelines

Mast to Fuse Connection Repair

Forum for kitesurfers
User avatar
darippah
Frequent Poster
Posts: 482
Joined: Sun Apr 22, 2012 9:07 pm
Local Beach: Nj
Style: Freestyle, Strapless waves
Brand Affiliation: None
Has thanked: 0
Been thanked: 3 times

Mast to Fuse Connection Repair

Postby darippah » Sun Jun 21, 2020 6:12 pm

Can anyone here suggest how to repair this crack at the bottom of the Mast? I filled it with Marine epoxy and left a thin coat twice and it cracked away after a few sessions each time

It seems there's some water inside the crack.

I use this set up for boosting with 548 and 600 wing so it gets a good amount of stress at this connection point.
Attachments
2020-06-21 13.07.25.jpg

Matty V
Rare Poster
Posts: 48
Joined: Mon Mar 23, 2020 2:24 pm
Kiting since: 1998
Gear: Home made
Brand Affiliation: None
Has thanked: 2 times
Been thanked: 4 times

Re: Mast to Fuse Connection Repair

Postby Matty V » Sun Jun 21, 2020 6:37 pm

Either very thin viscosity resin to penetrate the crack, clamp it and hope.

Or grind the crack deeper, it might go very deep, Lilly at least the depth of the screw inserts and fill with chopped carbon and the thin resin and again clamp and hope.

Likely though is that you won’t every get a full repair as the inserts will be moving from the landing/twisting for e you put on it when you land and the mast ultimately will be toast.

Try option 1
Try option 2

Try option 1 again keep it as a spare and get a new mast.

airsail
Frequent Poster
Posts: 240
Joined: Mon Jun 22, 2009 8:57 am
Local Beach: Queens
Favorite Beaches: Queens, Scarbs
Style: Freestyle
Gear: Bularoo 7, Yaga Pro 11, HP10&12, FS Psycho2 17,
Cardboard 136x46, Nobile 555 131x40
Brand Affiliation: None
Has thanked: 20 times
Been thanked: 20 times

Re: Mast to Fuse Connection Repair

Postby airsail » Sun Jun 21, 2020 6:48 pm

3CF53968-56A0-4F23-9502-443C78690D71.jpeg
Moses mast fuselage connection plate
There will be contaminates inside the crack on each surface, it is highly unlikely you will get adequate adhesion with an injection of glue. Very high stress area, and the insert plate has debonded on one side, that’s why it has cracked. Without a full rebuild it is almost impossible to fix and even then it may fail.
Time to save for new mast, the perils of boosting with a foil.
Last edited by airsail on Sun Jun 21, 2020 6:53 pm, edited 1 time in total.

User avatar
darippah
Frequent Poster
Posts: 482
Joined: Sun Apr 22, 2012 9:07 pm
Local Beach: Nj
Style: Freestyle, Strapless waves
Brand Affiliation: None
Has thanked: 0
Been thanked: 3 times

Re: Mast to Fuse Connection Repair

Postby darippah » Sun Jun 21, 2020 6:51 pm

airsail wrote:
Sun Jun 21, 2020 6:48 pm
the perils of boosting with a foil.
Hey, better the foil than my knees :lol:

TheJoe
Very Frequent Poster
Posts: 1447
Joined: Fri Oct 30, 2009 9:13 pm
Local Beach: Texas city levee, Galveston, El Jardine and Crystal beach.
Style: Freeride, Foil, Surf, a lil freestyle
Gear: North Reach 7,9,12
Brunotti TT
Moses 633/483
Dwarfcraft Micro
Brand Affiliation: None
Has thanked: 3 times
Been thanked: 31 times

Re: Mast to Fuse Connection Repair

Postby TheJoe » Sun Jun 21, 2020 7:01 pm

Matty V wrote:
Sun Jun 21, 2020 6:37 pm
Either very thin viscosity resin to penetrate the crack, clamp it and hope.

Or grind the crack deeper, it might go very deep, Lilly at least the depth of the screw inserts and fill with chopped carbon and the thin resin and again clamp and hope.

Likely though is that you won’t every get a full repair as the inserts will be moving from the landing/twisting for e you put on it when you land and the mast ultimately will be toast.

Try option 1
Try option 2

Try option 1 again keep it as a spare and get a new mast.
I would go with option 2. Try to get the water out as best as you can.

User avatar
tegirinenashi
Very Frequent Poster
Posts: 681
Joined: Wed Aug 27, 2014 3:29 am
Local Beach: 3rd Ave
Gear: Bates 4000, Dominator MX-10
Brand Affiliation: None
Has thanked: 15 times
Been thanked: 8 times

Re: Mast to Fuse Connection Repair

Postby tegirinenashi » Sun Jun 21, 2020 8:17 pm

Drill 2 mm hole along the crack. Open crack a little with knife. Use syringe to fill in the void. Clamp it.

In my experience bondo fiberglass resin from Home Depot is perfect for this kind of repair (no thinning is necessary).

User avatar
darippah
Frequent Poster
Posts: 482
Joined: Sun Apr 22, 2012 9:07 pm
Local Beach: Nj
Style: Freestyle, Strapless waves
Brand Affiliation: None
Has thanked: 0
Been thanked: 3 times

Re: Mast to Fuse Connection Repair

Postby darippah » Mon Jun 22, 2020 4:36 am

tegirinenashi wrote:
Sun Jun 21, 2020 8:17 pm
Drill 2 mm hole along the crack. Open crack a little with knife. Use syringe to fill in the void. Clamp it.

In my experience bondo fiberglass resin from Home Depot is perfect for this kind of repair (no thinning is necessary).

I will try this. Thanks!

revhed
Very Frequent Poster
Posts: 1320
Joined: Sun Feb 24, 2008 6:15 pm
Local Beach: france
Gear: kites
Location: France
Has thanked: 77 times
Been thanked: 21 times

Re: Mast to Fuse Connection Repair

Postby revhed » Mon Jun 22, 2020 11:06 am

Post would have been much better either in hydrofoil or gear builders, that said.
Put your STRUT in a black plastic trash bag and tape it shut.
Place in full sun.
Sometimes boards take days to dry but this should be quick, like an afternoon.
When u r sure absolutely sure NO H20 then proceed.
Open crack twisting inserted flat screw drive, sand with folded paper or even nail file.
Rough up well every where!
Use sun light or halogen to see well.
Clean acetone. also like as good as you can.
As posted above drill tiny holes if u think needed.
Then at least for me having done many repairs on many different problems the epoxy choice is vital.
At least here in E U I,we access ARALDITE from Huntsman in UK.
420 A/B is amazing!
I read and believe that this exact product is, was used to glue cameras to the outside of B-1 bombers.
But banned now here in France for toxic reasons.
I am sure you can find good quality epoxy either on their site of other well known company, 3M maybe?
Respect mixture ratios like to the tenth of a gram if doing small batches.
Mix well.
Wear chemical mask and better outside or well ventilated.
Make sure all surfaces are coated.
I use Seran wrap or normal kitchen cling wrap to stop over flow stick and sometimes in unison with thinnest layer of grease possible.
The two together can lead to ultra fine work!
Clamp, vac sack, sand bag what ever it takes to keep tight until FULLY dry!
ENJOY!
I have fixed delamed wings, broken boards, cracked fuses and STRUTS doing this, great success rate.
R H

User avatar
darippah
Frequent Poster
Posts: 482
Joined: Sun Apr 22, 2012 9:07 pm
Local Beach: Nj
Style: Freestyle, Strapless waves
Brand Affiliation: None
Has thanked: 0
Been thanked: 3 times

Re: Mast to Fuse Connection Repair

Postby darippah » Wed Jun 24, 2020 3:39 am

tegirinenashi wrote:
Sun Jun 21, 2020 8:17 pm
Drill 2 mm hole along the crack. Open crack a little with knife. Use syringe to fill in the void. Clamp it.

In my experience bondo fiberglass resin from Home Depot is perfect for this kind of repair (no thinning is necessary).
I tried this. The repair definitely held up better after a big boosting session. However still some minor cracking. Drilled another hole and will leave it in a black garbage bag in the sun for longer this time and see how that does. Hoping to not need a new Mast!


Return to “Kitesurfing”

Who is online

Users browsing this forum: appelton, Google [Bot], Yahoo [Bot] and 15 guests